Zinsco QFP3150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Plug-On
Quantity
Zinsco QFP3150 - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Serving as a critical main disconnect for commercial applications, this 150-amp unit provides reliable thermal-magnetic protection. It restores functionality to aging infrastructure without requiring complete system upgrades. The three-pole configuration mounts into classic Zinsco panelboards, offering an exact fit for older enclosures. It serves as a substitute for hard-to-find QFP24-150-3, QFP24150, and UBIZ3150 components. Load side lugs accept 1 AWG to 300 kcmil wire.Specifications
| Brand | Zinsco |
|---|---|
| Series | QFP |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Panelboards |
| Wire Gauge | 1 AWG - 300 kcmil |
| Max Wire | 300 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Main Breaker |
Product FAQs
5 answersWhich panelboards are compatible with the QFP3150 circuit breaker?
This 3-pole plug-on main breaker is designed exclusively for use in legacy Zinsco 3-phase panelboards and load centers.
What are the known cross-reference replacements for the QFP3150?
The Connecticut Electric UBIZ3150 is a recognized aftermarket equivalent that can be used in place of the original Zinsco QFP3150.
What wire sizes are accepted by the lugs on this breaker?
The terminal lugs on the QFP3150 accommodate conductors ranging from 1 AWG to 300 kcmil. Ensure proper torque specifications are followed during installation.
What type of trip mechanism does the QFP3150 use?
It utilizes a fixed thermal-magnetic trip unit featuring Long-Time and Instantaneous (LI) trip functions to protect against overloads and short circuits.
What safety precautions apply when replacing a Zinsco main breaker?
Since the QFP3150 operates as a main breaker, the utility power feed must be completely disconnected before installation. Due to the age of legacy Zinsco systems, a licensed electrician should inspect the panel bussing for signs of pitting or heat damage prior to installation.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
- KYKathleen Y.Verified BuyerReviewingMilbank UQFP-100 2 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars1/1/26Milbank 100 2 Pole Circuit Breaker
Product arrived on time, well packaged and exactly what we needed.
Jake was extremely helpful and courteous. You don’t find that too often these days. Will spread the word and recommend your company to all that require your service.
Thank you and Happy New Year
Sincerely,
K. Young
- QAquinlan a.Verified BuyerReviewingZinsco QFP2200T - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/26/25Great communication and customer service
Ordered QFP2200T breaker and paid to ship overnight. Reached out to company when breaker did not arrive on time. Although I did not get the breaker when expected, they did communicate the situation, refunded my shipping and expedited the breaker to me once it was ready for shipping. They handled the situation in the best possible way given the circumstances.
Would buy from them again.
-Quinlan (Q-Extra Electrical Services)
- ARAized R.ReviewingZinsco QFP2200T - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/7/21Excellent service!
I needed an obsolete part. They had it and sent it. Turned out it was the wrong part. Their customer service made up for it. They sent the correct part overnight and also sent a free ups label to return the wrong part. Great service! Highly recommend. And the refurbished part looked like it was in great shape.